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  1. crutschow

    Not working 12v dc to 220v Ac

    But are they all connected to the correct terminals? That could be a problem with a 12V transformer. That's why I suggested the test with a lower voltage.
  2. crutschow

    Not working 12v dc to 220v Ac

    Did you double-check all the connections, particularly those to the transformer?
  3. crutschow

    Not working 12v dc to 220v Ac

    Of course. But I don't think the high dissipation he is seeing is due to slow MOSFET gate rise and fall times @ 50Hz.
  4. crutschow

    Not working 12v dc to 220v Ac

    That resistance only effects the gate signal rise and fall times, it has no effect on the final gate voltage.
  5. crutschow

    Not working 12v dc to 220v Ac

    So you don't have a 10Vdc supply you can test with? Double-check all your wiring including the transformer.
  6. crutschow

    Not working 12v dc to 220v Ac

    The transformer magnetizing current is proportional to the average value of it's input waveform, not the RMS. This means a 12.6V square-wave (from a lead-acid battery) causes about a 16% higher transformer magnetizing current than a 12Vrms sinewave voltage, which may be saturating the...
  7. crutschow

    ADC Values

    There are a number of IC temperature sensors that have a quite linear output versus temperature.
  8. crutschow

    555 LED Circuit not playing nicely

    Look on the Internet at schematics of circuits. Most of those are properly drawn.
  9. crutschow

    Back Emf applied to same load?

    Can't. really understand what you want from your description, so please draw a schematic of what you have.
  10. crutschow

    Analog signal amplifier with OpAmp, Transistor or Darlington Pair?

    Ah, I see I confused my little self. :oops:
  11. crutschow

    555 LED Circuit not playing nicely

    Your schematic is very hard to follow with horizontal components and long wires with jogs. Please draw it with vertical components and short wires with minimum jogs.
  12. crutschow

    Analog signal amplifier with OpAmp, Transistor or Darlington Pair?

    I posted this previously, but it seems to have disappeared. It uses an op amp with a non-inverting gain of 1.5 and a negative offset of 0.75 volts to get the desired output. The op amp can be just about any rail-to-rail type.
  13. crutschow

    Wien bridge oscillator help...

    sure. But since I can't download those files to this forum how can I PM them to you?
  14. crutschow

    Wien bridge oscillator help...

    Are you measuring the resistance of the pot setting?
  15. crutschow

    Wien bridge oscillator help...

    Post a schematic of your circuit.
  16. crutschow

    DC Relay pull-in voltage range 3v-12v help

    The page states: - Work voltage: DC 3V/3.3V, so don't see how it would work from 12V.
  17. crutschow

    Audio Amplifier in Common Emitter Configuration

    Any limits on how long the battery should last? Any other design requirements?
  18. crutschow

    Audio Amplifier in Common Emitter Configuration

    Why does that amp need to be that design, as it as it is very inefficient and will not generate much power into an 8 ohm speaker?
  19. crutschow

    Would like to know which wire to snip.... if I can even do that

    May I ask, why?
  20. crutschow

    Constant current source

    The are just to roll-off the feedback high-frequency response and improve the stability of the op amp feedback loop. The op amp negative feedback loop always tries to keep the voltage between its (+) and (-) inputs very close to 0V (typically a few mV or less), thus it adjusts the MOSFET gate...
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